If the rotation of optically pure (R)-2-chlorobutane is +33.2°. What is the rotation of -16.6º. +64.4° -64.4°. this can only be optically pure (S)-2-chlorobutane? -33.2⁰ 0⁰ +16.6⁰ determined experimentally
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- 5. The specific rotation of (S)-2-iodobutane is +15.90°. Draw the structure of (S)-2- iodobutane, predict the specific rotation of (R)-2-iodobutane, and determine the percentage composition of a mixture of (R)- and (S)-2-iodobutane with a specific rotation of -7.95°.If (S)-2-ethyl-1-hexanol has a specific rotation of -20.05 degrees, what is the specific rotation of (R)-2-ethyl-1-hexanol ? -20.05 degrees 20.05 degrees 0 degrees It must be experimentally determined.Consider a solution that contains 84.0% R isomer and 16.0% S isomer. If the observed specific rotation of the mixture is −37.0°, what is the specific rotation of the pure R isomer? [a] = = O
- How can we decide whether an observed rotation of a solution of an optically active compound is +170° and not actually -190°?When 0.018 g of cholesterol is dissolved in 1.00 mL of ether and placed in a sample cell 10.0 cm in length, the observed rotation at 20 degrees (Using the D line of sodium) is -0.0567 degrees. Calculate the specific rotation of cholesterol. specific rotation= [α] =The specific rotation of (S)-carvone (at 20 degrees) is +61. A chemist prepared a mixture of (R)-carvone and its enantiomer, and this mixture had an observed rotation of -55. (a) What is the specific rotation of (R)-carvone at 20 degrees?
- A certain compound has a specific rotation of -43.2o (c = 5, toluene). What is the observed rotation of a sample of 1.24 g of the enantiomer of this compound when diluted to a concentration of 1.00 g ml-1 in the same solvent? Example 30 In his classic studies of stereochemistry and optical activity in organic compounds, Pasteur measured the optical activity of many solutions. For the naturally occurring enantiomer of tartaric acid, [α]D20 = +12.4o (c = 20, H2O). What can be concluded about the ratio of tartaric acid enantiomers present in the solution if the observed rotation is (i) α = -6.0o, or (ii) α = 0o?The specific rotation of L-dopa in water is -39.5. The specific rotation of a solution of L-dopa and its enantiomer was determined to be -19.75. Calculate the % of L-dopa in the solution. Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a b с d e 15% 25% 50% 75% 80%The specific rotation of (S)-2-iodobutane is +15.90°. Predict the specific rotation of (R)-2-iodobutane.
- The specific rotation of L-dopa in water is -39.5. The specific rotation of a solution of L-dopa and its enantiomer was determined to be -19.75. Calculate the % ee of this mixture. Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a b с P e 15% 25% 50% 75% 80%5. The specific rotation of (S)-(+)-2-bromobutane is +23.1°. Calculate the enantiomeric excess for a sample of 2-bromobutane that has an observed specific rotation of +9.2º.A sample of limonene has a specific rotation of +74.l°. R-(+)-limonene [a]p = +125.6° and S-(-)-limonene [a]p = -122.1'. What is the percent enantiomercic excess (% ee)? % ее: What is the molecular composition of this same sample? percent of S isomer: % percent of R isomer: %